Developing apparatus



Sept. 25, 1945. F. R. BRICK DEVELOPING APPARATUS Filed Jan. 27, 1943 5Sheets-Sheet l [NW-FUR Frank R. Brick [1/ M ATTORNEY 3 Sheets-Sheet 2 F.R. BRICK DEVELOPING APPARATUS Filed Jan. 27, '1945 wk 5 {a mmwifi GSept. 25, 1945.

Sept. 25, 1945. F. R. BRICK DEVELOPING API ARATUS 3 Sheets-Sheet 3 FiledJan. 27, 1943 Fig. 6

Fig. 6

A v R m L E O r r N 7 B y R 4 o .r v R T Fur N T Patented Sept. 25, 1945mass UNITED STATES PATENT OFFICE 2,385,681 DEVELOPING APPARATUS Frank R.Brick, Elizabeth, N. J. Application January 27, 1943, Serial No. 474,517

3 Claims.

This invention relates to high speed developing apparatus and moreparticularly to high speed facsimile systems wherein the received signalimpressed upon a cathode ray tube and energizes the same to produce boththe scanning of a, recording paper and variations in the intensity ofthe various elemental shades recorded thereon.

In the development of facsimile apparatus of various kinds, the originalgoal was simply the production of any kind of picture record thereon.This in itself was considered a desirable end;

As the methods of transmission and reception of facsimile signalsimproved, the mere production of a picture was taken for granted, andall efforts were directed at improvement in the recorded picture itselfso that the record made by the facsimile receiver approached closer inaccuracy and appearance to the original transmitted image.

Various problems, inherent in the creation of a perfect facsimilereproduction, were solved by the improvement and development of newsynchronizing apparatus, as set forth in Patent Nos. 2,296,274 and2,290,231; by the improvement in scanning systems, as shown in PatentNo. 2,212,970 and by improvements in methods of transmission andreception, as shown in Patent Nos. 2,082,692 and 2,290, 29.

Recently, however, an entirely new problem arises in the transmissionand reception of facsimile reproductions. While accuracy in detail andtransmission is important, in many instances, quality of the reproducedimage is secondary to the speed of transmission and reception of theimage. The prime desideratum in many applications of facsimiletransmission and reception is the reception of a recorded image by andat very high speed.

Thus, while in the facsimile systems, set forth in the patents abovementioned, it was possible to obtain a scanning rate as great as onehundred lines per minute,

ertheless, in high speed operation for the facsimile transmission ofwritten messages or of di ing the simplicity of the apparatus itself.

The principal distinction between facsimile a recorded image is directlymade which is retained permanently in record form; in television toprovide for high speed reception, it is so arranged, however, thatquality reproduction is also possible, and so that the image receivedmay be of a character approaching in its various shades and tones thequality of the transmitted image.

My apparatus embodies mechanism for mov ing sensitized recording paperrapidly past a cathode ray tube and thereafter rapidly devel oping therecording paper.

My mechanism further embodies means for moving the electron stream ofthe cathode ray tube to various successive positions which willdetermine not merely the intensity of the received image but also thescanning rate thereof.

As the cathode ray beam or electron stream is moved from side to sideacross the fluorescent screen of the cathode ray tube, the oscillatingspot is recorded on the sensitized paper in the form of a scanning line.Also, as the fluorescent spot is moved outwardly or downwardly in adirection normal to the scanning direction, it may move into softer andsharper focus with respect to the sensitized recording paper and thusproduce a darker or lighter spot thereon.

The principal object of the present invention, therefore, is theproduction of a'high speed facsimile receiving system.

An additional and corollary object of the present invention is theutilization in a high speed facsimile receiving system of a cathode raytube as the scanning and recording medium operative on a sensitizedrecord sheet.

Another object of the present invention is the provision of means formoving the sensitized record sheet past the face of the cathode ray tubein order to record the various positions of the fluorescent imagethereon.

Materials are known which, when subjected to the influence of light oreven of a fluorescent light spot of a type produced by cathode ray tube,will retain an image thereon. However, such images are rather weak andrelatively transient; they may suffice for immediate transmission andreception of a signal, but are not are to be made.

efficient where permanent records Where a permanent record is desired,the best method is to utilize a recording paper coated or impregnatedwith a photo-sensitive emulsion similar to that used in ordinaryphotographic apparatus and to provide in connection therewith means forrapidly developing the latent image produced by the impingement oflight.

Accordingly, another object of this invention is the provision, inconnection with facsimile receiving apparatus, of high speed developmentmeans for photo-sensitive recording paper whereby a latent image thereonmay be rapidly developed for visual examination.

Still another object of this invention is the provision of means forsynchronizing the movement of the photo-sensitive recording medium pastthe face of the cathode ray tube in order to obtain a coherent imagethereon.

These and many other objects of the present invention will be apparentand, where not apparent, pointed out in the following description anddrawings in which:

Figure 1 is a partly schematic view in cross section showing thefacsimile receiving apparatus of the present invention.

Figure 2 is a top plan view taken along line 2-2 of Figure 1.

Figure 3 is a cross sectional view taken along line 3--3 of Figure 1looking in the direction of the arrows.

Figure 4 is a cross sectional view taken along line d-l of Figure 1.

Figure 5 is a cross sectional view taken along line 55 of Figure 1.

Figure 6 is a cross sectional view taken along line 6--6 of Figure 1looking in the direction of the arrows.

Figure '7 is a cross sectional view taken along line l--l of Figure 1looking in the direction of the arrows.

Figure 8 is a cross sectional view taken along line 2-8 of Figure 1.

Figure 9 is a cross sectional view taken along line 9-9 of Figure 1.

Referring now to Figure l, I have here shown partlyin cross section afacsimile receiving machine, in accordance with the present invention,which comprises a main housing having a plurality of vertical supportingcross members 2 i, 22, 23, and 2d, and horizontal partitioning andsupporting members 27, 28. The housing itself is divided substantiallyinto thre parts by various vertical partitioning members. Section 30,defined by the vertical members 2| and r 22, and the horizontal members21 and 28, serves to house the supply roll 3! of sensitized paper.Section 32, defined by the top and bottom walls and the verticalpartitions 2i and 23, houses the principal guiding and feeding mechanismfor the sensitized recording paper. Section 33, defined by the top andbottom walls, and by the vertical partitions 23 and 24, houses thedeveloping apparatus for the sensitized recording paper. Section 36,defined by the vertical outside wall 213 and the outer protective casing31 houses the feed-out mechanism which delivers the finished developedstrip.

The cathode ray tube W is secured to its own base M which, in turn, issecured in any suitable manner as, for instance, by the screws 62 to thetop plate 53 of the circular housing M which surrounds and protects thecathode ray tube.

The housing 36 carries on opposite sides thereof a pair of extensions46, 36 at the ends of which are secured a pair of sleeves 41, I! whichare adapted to fit over standards 48, 48 secured to the top wall of thehousing 20.

Set screws 50, tapped through openings in the sleeves 41, are rotatableinto engagement with the standards 48 to fix the position of thehousing, and hence of the cathode ray tube 40 with respect to theremainder of the apparatus.

' A lens system 52 is mounted on a suitable base 53 which, in turn, issecured in any suitable manner as, for instance, by the bolts and nuts54 to the top wall of the housing.

A suitable opening 51, in the form of a slot, is provided in the topwall of the housing immediately below the lens system to permit thefluorescent spot on the face 58 of the cathode ray tube to be focusedtherethrough.

Thefluorescent spot is brought to focus through the filter plate 60 (thefunction of which is hereinafter more specifically described) on thesensitized recording paper 6| which moves over the feeding sprocket 62.

The housing, as may readily be seen in Figures 2 and 3, is provided withtwo side doors 64 and 65 which may be removed in any suitable manner,but which are preferably swung on the hinges 66 and 61. When the door 66is swung open on its hinge B1,.sections 30 and 32 of the interior of thehousing are opened. The supply roll SI of the sensitized recordingmaterial may then be placed on the shaft 10 which extends from theopposite side of the housing. The sensitized recording paper is thenthreaded through the slot I2 in the vertical partition 22 between theguide rollers 13, i3 and over the sprocket wheel 62.

In order to ensure a positive feed of the sensitized recording paper ti,this paper is provided with a plurality of spaced openings along theside thereof in the manner of motion picture film, which openings areengageable by the teeth of the sprocket. The recording paper is heldsecurely against the face of the sprocket 62 by means of the pressurerolls l5, it, each of which is mounted at one end of a lever 16 pivotedat 17 on a bracket A 18 depending from the upper surface of the hous-The roller carrying ends of each of the levers 1B is urged downwardly bymeans of compression spring mounted on the shaft 8|, pivoted at 82 onthe bracket 78, and captured between the opposite end of the lever 16and the lock nut 83.

The sensitized recording paper 6! is then threaded through a slot 85 inthe vertical partition 23 over the sprocket 86, then over the variouspulleys in and above the developing tanks, as hereinafter more fullydescribed, to the feedout sprocket 88.

Sprockets 36 and 88 may also be provided with pressure rollers 98 and 92rotatably mounted on the swinging arms 93 and 94. These rollers may beurged downwardly by means of the compression spring 80 mounted on theshaft 8!, pivoted at B2 on the bracket 18, and captured between theopposite end of the lever 16 and the lock nut 83. The sensitizedrecording paper 6| is then threaded through a slot 85 in the verticalpartition 23 over the sprocket 86, then over the various pulleys in andabove the developing tanks, as hereinafter more fully described, to thefeedout sprocket 88. Sprockets 86 and 88 may also be provided withpressure rollers 90 and 92 rotatably mounted on the swinging arms 93 and96. These rollers may be urged downwardly in any suitable manner, eitherby their own weight,

as shown in Figure 1, or by any suitable pressure medium, such assprings.

The pressure rollers I5, 90 and 92 may each have a form, more fullyshown in the cross sectional view of Figure 4, where the pressure roller92 is shown.

, It will be obvious that it is important that pressure must bemaintained on the sensitized recording paper in order to hold the samein engagement with the socket. However, this pressure need notnecessarily be over the entire surface of the recording paper, and it ispreferred, indeed, that the pressure be maintained only at the margins.The margins of the paper, however, are engaged by the sprockets of thesprocket wheels.

Accordingly, each of the pressure rollers I5, 90, and 32 are provided,as seen in the cross sectional view of Figure 4, with a central annularrecess I substantially equal in width to the recording surface of thesensitized record sheet 6I. Each roller is provided with outer annularflanges IOI engageable with the margin of the sensitized recordingsheet. Each of the flanges IOI is provided with an annular groove I02which will clear the sprockets of the sprocket wheel (sprocket wheel 88in the illustration of Figure 4).

In addition, each of the sprocket wheels 62, 86 and 36 of Figure 1 mayhave the same general form as the sprocket wheel 08, shown moreparticularly in Figure 4, that is, sprocket wheel 88' may have a centralannularrecess I05, which clears the recording surface of the sensitizedrecord sheet GI and thus does not tend to mar it any way, and outerannular flanges I06 carrying sprocket teeth for engagement with themarginal openings in the recording sheet.

When the door 65 is swung on the hinge 66. then the developing tanksection 33 of the apparatus is open. This section consists preferably ofspace for three tanks IIO,'II I and H2. Tank II0 'is filled with asuitable developer; tank III with a suitable fixing solution; and tank II2 with a. suitable washing medium such as ordinary water.

Each of the tanks, as is seen in Figures 1, 6, and 7 (particularlyFigure '7) is provided with avertical channel II on each side preferablycentrally located. The channels H5 proved guide rails for the yoke II6(see particularly Figure 6) which carries the guide pulley I I!rotatably journalled between the tines H8, H8 thereof. Each of theyokesH6 in each of the tanks has secured thereto at its upper end a verticalrod I20, the upper end of which is threaded at I 2I and is adapted toproject through the opening I22 in the top surface of the housing. Theopposite side walls I30, I3I at the upper portions of the housing(Figure 6) are provided with, channel shaft rails I I5 registering withthe channel member I I5, I I5 in the tank.

The upper end of each of the rods I20 carries a sleeve I24 thereon, thesaid sleeve having an outer diameter greater than that of the openingI22 and carrying also a set screw I25. The outermost ends of the rod I20each carries an adjustable nut I2'I threaded on the threaded end I2I ofthe rod I20. After the door 65-has been opened, the set screws I25 areloosened and the rods I20 are lifted upwardly until the yokes H6 andtheir associated pulleys II'I ride up onto the rails H5 and clear thetops of each of the tanks I'III. III and H2. The set screws I25 on eachrod may then be tightened with the sleeve I24 bearing against the uppersurface of the housing thereby maintaining the rods I20 and the pulleysIII in raised position. The tanks IIO, III and H2 may then be removed.After they have been cleaned and refilled, they are then replaced in thehousing.

Section 33's placement and spacing are approximately guided by theflanged cross bars I33, I34, I35 and I36. Bars I33 and I34 are securedto the bottom wall of the housing in appropriate spaced relation. BarsI35 and I36 are supported from at least one of the side walls of thehousing.

On replacement of the refilled tanks IIO, III and II 2, the sensitizedrecord sheet, which has already been threaded over the sprocket 62 andover the sprocket 86 is not threaded under the pulley III of tank I I.The set screw I25 of the rod carrying this pulley is nOW loosened, andthe yoke II6 carrying the pulley now slides down the rail 5' onto therail II5 of tank H0. The free end of the sensitized record sheet now ispassed over the first guide pulley I40 and again is passed beneath thepulley I I! of tank II which is now slid down in the same manner as wasthe first pulley of tank H0. The recording sheet is then passed over thetop of the second pulley I40 between tanks H0 and H2, and then' underthe pulley III which is again slid down, and then once more over thethread of the upper guide pulley I40 onto the delivery or feed-outsprocket 88. 1

Should it be desirable to adjust the depth of the pulleys II'I, thentheset screw I25 on sleeve I24 may be loosened, and the nut I2'I may berotated thus raising or lowering the pulleys III, and the set screw I 25may then be tightened once more.- The pulleys I H are thus simply guidepulleys and need not be rotated. Likewise, the pulleys 340, as mayreadily be seen in Figure 8, are simply supported on a stub shaft I42extending from one of the side walls of the housing. Each of the guidepulleys II! and I40 may, as seen in Figures 7 and 8, have a centralrecessed portion I45 substantially equal in width to the recording areaof the sensitized record sheet and thus out of contact therewith. Theyeach also have a marginal record sheet supporting area I46 on each sideon which the record sheet may bear, and retaining flanges I41, I41 toaccurately position the record sheet.

Again, the pulleys are so arranged that no contact is made at any timein the process with the recording surface of the record sheet. and theeveloping fluids may flow freely about the record sheet even while it ison a pulley H1.

Each of the tanks IIO, III and H2 is provided with a squeegee I50 at itsupper end. The squeegee, as seen more particularlv in Figure 5. consistsof a spring metal member I5I suitably secured to the side wall of thetank in an appropriate manner. preferably by the rivet I52.

The tines of the spring metal member .carrv secured thereto squee eesupport members I53,

I53 to carry the squee ee material I54 which may be sponge rubber, solidrubber, or any other suitable squeegee material.

After the record paper has been threaded over the various pulleys, andthe pulleys inserted in the tanks, the sensitized-recording naner SI isslid between the squee ee member I53. This s possible since the squeegeemembers are located at the tops of the tanks and may be readily reachedtherefrom. The tanks are here shown so arranged that thev may readily beremoved and rep aced for drainage, cleaning and filling purposes.

It is obvious, however, that various modifications may be made anddrains may be inserted in the tanks to permit the draining of exhaustedfluids and replacement thereof by fresh developing and fixing fluids.

However, the present method makes possible the thorough cleaning of thetanks before refilling thereof and facilitates the threading of thesensitized recording sheet on the various pulleys which guide the samethrough the tanks.

The only members which must be driven in this present device are thefeed sprockets 62, 86 and 88. The feed sprocket 62 is driven from themotor I60, mounted on a platform at the base of the apparatus (seeFigure 6). This motor, if desired, may be mounted in the compartment I10beneath the supply roll 3|, or may be mounted in the base of compartment32 which is the preferable location. However, for purposes of simplicityin illustration, this motor has been shown mounted outside the housing.Similarly, the various connecting members, especially the connect- 4 ingmembers between the motor and the main sprocket, may also be mountedwithin the section 82 of the housing; although these connections areshown outside the housing.

Likewise, the various connecting members to the sprockets 86 and 83 mayreadily be mounted within the housingon either side of the developingtank section although, as in Figures 2 and 6, they are shown mountedoutside the housing.

The motor I60 is connected by the chain I 6| to the driving sprocket I62which is mounted on the shaft I63 which carries the main feed sprocket62. Consequently, rotation of motor I60 results in operation of the feedsprocket 62 and the drawing of the sensitized paper from the supply rolliii. The opposite end of shaft I63 carries the bevel gear I62 whichmeshes with the bevel gear I65 which, in turn, rotates the shaft I66journalled in the bearin I61 on the bracket I68 extending from thehousing. Shaft I66 is connected by the universal joint I65 to the shaftI16 journalled in bearings I11, I11 mounted on brackets I18, I18 on theside of the housing. Shaft I26 carries bevel gears I80 and I8I whichmesh respectively with bevel gears I82 and I 83. Bevel gear I82 drivesthe shaft I85 which carries sprocket 86, and bevel gear I83 drives theshaft 36 which carries feed-out sprocket 88.

The gear ratios are so arranged as to cause the peripheral speed of eachof the sprockets 62,

86 and 66 to be substantially the same. In other words, therefore, itwill be necessary for sprockets 66 and 88to rotate at a much greaterspeed than sprocket 62. Sprocket 62 is of enlarged diameter that thescanning surface presented for the scanning mediurrrwhen the recordingsheet 6| is on sprocket 62 is relatively plane. Since the scanning areais very narrow, however, it is essential that the recording sheet travelin a perfect plane at the time of scanning. It is suihcient if it iscurved on a relatively large diameter which is provided by the increasedsize of the sprocket 62.

The universal joint I15 between the shafts I66 and I16 will result insome unevenness in the rotation of shaft i 16 and consequently in someunevenness in the rotation of sprocket wheels 86 and 88. This is a knowncharacteristic of universal joints. The unevenness occurs twice in eachrevolution of shaft I16; that is, shaft I16 will reach a maximum and aminimum speed twice in each cycle. However, owing to the high speeddrive from shaft I16 to shafts I85 and I86,

such maximum and minimum speed will occur many times in the rotation ofsprockets 86 and 88 and will occur to a much less extent in each casethus tending to iron out the rotation thereof to a substantiallyconstant average speed. and thus diminishing any excessive pull on thesensitized recording sheet 6|.

Such rapid variations between a slightly elevated and slightly lessenedspeed will not, therefore, tend to pull the paper unduly. However, inorder to obviate any possibility of the tearing of the paper, a smallamount of slack may be left between the sprockets 62 and 86 so that thesensitized recording sheet 6! will sag slightly therebetween.

The sprockets 86 and 88 have exactly the same characteristics ofrotation so that no slack is necessary therebetween although it may beprovided. It is preferred, however, in order to ensure the propermovement of the recording sheet 6i through the developing tanks thatsubstantially no slack be provided between the sprockets 66 and 88. Thiswill further ensure that the sensitized recording sheet 6| will alwaystravel on the annular surfaces I 06 of each of the pulleys H1 and I60and will not be removed therefrom.

I have found in actual operation that no short stop bath of any kind isessential in the development of the sensitized sheet. Proper adjustmentof the developing bath with respect to the time during which the sheettravels therein coupled with the squeegee action of the squeegee memberI50 prevents to a substantial extent any intermixture of the materialsof the various baths.

Obviously, all of the doors and openings of the housing 20 arelight-tight to prevent any stray images on the recording sheet.Likewise, the housing member 64 for the cathode ray tube may be extendeddownwardly to the upper surface of the housing 20 to produce alight-tight seal thereat. This is essential since the lens system 52 isso arranged that it will gather light from the The sensitized recordingsheet BI is drawn from the supply roll 8i by the main sprocket 62; isscanned by the electron beam from the cathode ray tube 80; is then drawnonwardly by the sprocket 86; is then fed under pulleys I I1 and overpulleys Hi0 through the various tanks to the feed-out sprocket 68; andis fed downwardly therefrom through the opening I90 whence it may bedrawn off and read.

The recording tape, after it leaves the opening I98, may pass over anysuitable platen of any suitable length where it may easily be read andthen be led to a wind-up reel where it may be preserved. The latter,however, is not essential.

The flange 31 is provided in order to further ensure the light-tightnessof the device. The interior of the flange 31 is coated with a dead blackpaint prevent light reflections therein so that it is extremely unlikelythat any light will be reflected up through the opening I and thenthrough the slot I9I in the end wall 24 into developing tanks. Again,owing to the squeegee action which occurs, especially after therecording sheet 6| leaves the last tank H2, it has been found that thesheet II, when it is withdrawn through the opening I90, is only slightlydamp and may easily be handled and read.

Various methods may be utilized to operate the cathode ray tube toproduce a scanning of the sensitized recording sheet ll. One such methodis shown in Patent No. 2,082,692.

Various other methods may be utilized to maintain synchronism betweenthe movements of the sensitized recording sheet GI and the scan ningoperation of the cathode hay tube. Such methods may include the tuningfork synchronizing system shown in Patent No. 2,178,394.

In the foregoing I have set forth my invention relating to a high speedsensitized paper feeding medium and development means in one preferredembodiment thereof. Many variations in the various steps of the processand in the various parts of the apparatus should now be obvious to thoseskilled in the art.

Also, while I have set forth my invention in connection with but onetype of transmitting and receiving medium and one simplified form ofsynchronizing apparatus, various other types of transmitting andreceiving apparatu and various other types of synchronizing operationsmay be used in connection with my present invention. Accordingly, Iprefer to be bound not by the speclflc disclosures herein but only bythe appended claims.

I claim:

1. In a high speed facsimile recorder adapted to receive and recordlight impressions on a movlng record strip, a developing tank, the saidtank having an open top and a closed bottom and a pair of substantiallyparallel side walls, railmembers arranged vertically along the interiorof each of said parallel side walls and disposed substantially oppositeeach other, a yoke member adapted for vertical sliding movement in saidrail members and positioned by said rail members between said sidewalls, a pulley rotatablycarried by said yoke, and means for raising andlowering said yoke, said tank being removable from and insertable in theremainder of the apparatus, said apparatus having a frame surroundingand positioning said tank including a pair of spaced wallmembers abovethe top opening of said tank and extending in planes substantiallyparallel to the parallel pair of wall members of said tank, a pair ofrail members in said last mentioned wall members of said frame, saidrail members being aligned with the respective rail members of the tankwhen the tank is in position in said frame, said yoke being slidable outof the tank from the rail members of the tank on to the rail members ofthe frame, said tank being thereby removable from said apparatus whilesaid yoke and pulley remain therewithin.

2. In a high speed facsimile recorder adapted to receive and recordlight impressions on a moving record strip,'a developing tank, the saidtank having an open top and a closed bottom and a pair of substantiallyparallel side walls, rail members arranged vertically along the interiorof each of said parallel side walls and disposed sub-,

stantially opposite each other, a yoke member adapted for verticalsliding movement in said rail members and positioned by said railmembers between said side walls, a pulley rotatably carried by saidyoke, and means for raising and lowering said yoke, said tank beingremovable from and insertable in the remainder of the apparatus, saidapparatus having a frame surrounding and positioning said tank includinga pair of spaced wall members above the top opening of said tank andextending in planes substantially parallel to the parallel pair of wallmembers of said tank, a pair of rail members in said last mentioned wallmembers of said frame, said rail members being aligned with therespective rail members of the tank when the tank is in position in saidframe, said yoke being slidable out of the tank from the rail members ofthe tank on to the rail members of the frame, said tank being therebyremovable from said apparatus while said yoke and pulley remaintherewithin; said means for raising and lowering said yoke comprising a.rod attached to said yoke, said rod passing upwardly between the spaced.walls of the tank and the spaced walls of the frame, a support mountedacross the top of the spaced walls of the frame, means in said supportfor slidably receiving said rod, and additional means in said supportfor locking said rod in selected position.

3. In a high speed developing system, a frame having a top wall, endwalls, side walls and a bottom wall, a slot in each of the end walls forpermitting the passage therethrough of a sensitized record strip,openings in one of the side walls and covers therefor, a developingtank, means associated with the bottom wall for positioning said tank insaid apparatus through the openings in said side wall, a pulley carriedwithin said apparatus above the top of said tank, means in said tank forpositioning a pulley adjacent the bottom thereof, said pulleyscomprising means for guiding said record strip from the slot in one endwall through the tank to the slot in the opposite end wall, said meansfor positioning a pulley adjacent the bottom of the .tank comprising apair of spaced substantially vertical channel shaped members in theinterior of the tank, a yoke spanning the distance between said channelshaped members and slidable vertically therein, said yoke carrying saidpulley, the parts of the side walls of the apparatus above said tankalso carrying a pair of spaced channel members, the spaced channelmembers in said tank being alignable with the spaced channel members onsaid side walls of said apparatus, said yoke being slidable from thechannel members of said tank out of the tank and onto the spaced channelmembers carried by the side walls of said apparatus.

FRANK R. BRICK.

